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检索条件"机构=Post-Graduate Program in Electrical Engineering"

共 246 条记录，以下是181-190 订阅

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Low-Power Energy Conversion Systems With Two-Phase PM Machine and a Rectifier with Reduced Number of Controlled Switches

Low-Power Energy Conversion Systems With Two-Phase PM Machin...

引用

IEEE Energy Conversion Congress and Exposition

作者： Cursino B. Jacobina Victor F. M. B. Melo Filipe A. da C. Bahia Italo Roger F. M. P. da Silva Electrical Engineering Department - Federal University of Campina Grande - UFCG Campina Grande Paraiba Brazil Post-Graduate Program in Electrical Engineering - PPgEE - COPELE - UFCG

ISBN: (纸本)9781479957774

This paper presents two energy conversion systems with two-phase permanent magnet (PM) machine and a rectifier with reduced number of controlled switches. The topologies are conceived with the purpose of converting wind energy into electrical energy (i.e., a wind energy conversion system (WECS)) for low power applications. Compared with some three-phase generation systems with reduced number of controlled switches, the proposed topologies permit obtaining sinusoidal controlled machine currents, reducing dc-link voltage and dq currents low harmonic distortion.

关键词： Topology Voltage control Harmonic distortion Legged locomotion Harmonic analysis Control systems Wind energy

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PARALLEL AC-DC SINGLE-PHASE ASYMMETRICAL BOOST RECTIFIERS

PARALLEL AC-DC SINGLE-PHASE ASYMMETRICAL BOOST RECTIFIERS

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Annual Conference of the IEEE Industrial Electronics Society

作者： Nustenil S. M. L. Marinus Cursino B. Jacobina Nady Rocha Rodolpho M. B. Cavalcanti Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Electrical Engineering Department (DEE) Federal University of Paraiba (UFPB)

ISBN: (纸本)9781479940318

In this paper, three unidirectional single-phase rectifiers are proposed. Each converter is composed of two non-controlled legs and two controlled legs. Modelling and control strategy of the system, including a synchronization method, are proposed. In the synchronization method, the grid current is synchronized with the generated voltage ensuring a sinusoidal grid current without zero-crossover distortions. Analysis of harmonic distortion and semiconductor losses are presented. Simulation and experimental results are shown for validation purposes.

关键词： Topology Synchronization Voltage control Legged locomotion Harmonic distortion Inductors Semiconductor diodes

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A comparison of techniques and technologies for SSVEP classification

A comparison of techniques and technologies for SSVEP classi...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Richard M. G. Tello Sandra M. T. Müller Teodiano Bastos-Filho Andre Ferreira Post-Graduate Program of Electrical Engineering (PPGEE). UFES Vitoria Brazil Department of Computer and Electronics (CEUNES) Sao Mateus Brazil

This paper presents the evaluation of seven techniques of feature extraction (PSD, F-Test, EMD, MCE, CCA, LASSO and MSI) for gaze-target detections in a SSVEP-based BCI. Two type of technologies for visual stimulation were used (LCD and LEDs). Five differents windows lengths (1, 2, 4, 5 and 10 s) were used and seven volunteers participated in this study. The highest accuracy obtained in all cases was 93.57% using LEDs and the highest ITR was 36.90 bits/min for LCD. The technique based on MSI shows the highest success rate in both cases (LCD or LED) and is even more noticeable when the window size is increased.

关键词： Feature extraction Light emitting diodes Electroencephalography Correlation Electrodes Visualization Accuracy

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Comparison of new techniques based on EMD for control of a SSVEP-BCI

Comparison of new techniques based on EMD for control of a S...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Richard M. G. Tello Sandra Mara Torres Müller Teodiano Bastos-Filho Andre Ferreira Post-Graduate Program of Electrical Engineering (PPGEE). UFES Vitoria Brazil Department of Computer and Electronics (CEUNES) Sao Mateus Brazil

ISBN: (纸本)9781479924004

This paper presents the comparation of three different feature extraction techniques based on the Empirical Mode Decomposition (EMD) for a SSVEP-BCI. This approach based on the characterization of the signal by EMD, is proposed as a novel alternative to other techniques and it was demonstrated that it exceeds both in accuracy rate and Information Transfer Rate (ITR). The experiments were performed in an offline way, and seven volunteers participated of the study. The stimulis were generated both by LCD and LEDs. The frequencies used were 8, 11, 13 and 15 Hz. The results here reported such represent the average of the seven participants, achieving a success rate of 81% and ITR of 23.32 bits/min of the total set of cases analyzed. It is further confirmed that the highest success rates and ITRs were obtained for stimulation by LEDs.

关键词： Electrodes

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Computing stress-related emotional state via frontal cortex asymmetry to be applied in passive-ssBCI

Computing stress-related emotional state via frontal cortex ...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Anibal C. Atencio Javier C. Garcia Alessandro B. Benevides Berthil B. Longo Andre Ferreira Alexandre Porner-Escher Maria Dolores P. de Souza Teodiano Bastos Post-Graduate Program of Electrical Engineering Federal University of Espirito Santo Vitoria ES Brazil Post-Graduate Program of Biotechnology Federal University of Espirito Santo Vitoria ES Brazil Universidade Federal do Espirito Santo Vitoria ES BR Post-Graduate Program of Psychology Federal University of Espirito Santo Vitoria ES Brazil

The identification of stress-related emotional states allows the use of a passive single-switch BCI (passive-ssBCI) together with a main multi-class BCI. Thus, the passive-ssBCI could work in the background of the main BCI, allowing it to recognize stress-related emotions and to switch to a “stress mode”, which allows a better adaptation to the user current mental state, leading the system to better success rates. Frontal cortex asymmetry gave evidence that greater right frontal activity seems to be more highly related to negative emotional states. In this work, index of asymmetry of alpha band was computed by comparing the power of contra-lateral frontal electrodes. Discrete Wavelet transformation was used to decompose the EEG signals in frequency bands. The power spectral density was then calculated using modified Hamming periodogram. Signals from a public database for the analysis of human affective states, which was labeled with volunteers self-assessment scores, were employed. In order to label negative stress-related emotional state, rules based on valence, arousal and dominance dimensional emotions were defined. The results were promissory, because computed index of asymmetry in the alpha band indicated activity into the right frontal hemisphere was higher than the left one for seven out of nine volunteers during negative emotional states. This index could be employed as switch to a “stress mode” in a passive-ssBCI.

关键词： Indexes Electroencephalography Electrodes Frequency estimation Emotion recognition Switches

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AC drive systems based on six-phase machine with three neutrals

AC drive systems based on six-phase machine with three neutr...

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IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Reuben P. R. Sousa Cursino B. Jacobina Victor F. B. Melo Nayara B. de Freitas Post-Graduate Program in Electrical Engineering - PPgEE Bairro Universitário Campina Grande Paraíba Brazil Department of Electrical Engineering - DEE Bairro Universitário Campina Grande Paraíba Brazil

This paper presents an AC drive system based on six-phase machine with three neutrals. The machine side converter has nine power legs and can be connected to the grid through one single DC-link or three isolated DC-links. Compared with the conventional back-to-back AC six-phase machine drive system, the proposed drive system permits reducing the DC-link voltages, eliminating step-up transformer, and the voltage at the grid side converter has higher amplitude than that of the machine side, reducing the transmission I 2 R losses. The system model and PWM strategy are presented and experimental results demonstrate the feasibility of the system.

关键词： Vectors Inverters Pulse width modulation Torque Integrated circuit modeling Switches electrical engineering

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Distributed approach for channel quality estimation using dedicated nodes in industrial WSN 25

Distributed approach for channel quality estimation using de...

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2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014

作者： Gomes, Ruan D. Rocha, Glaucio B. Filho, Abel C. Lima Fonseca, Iguatemi E. Alencar, Marcelo S. Post-Graduate Program in Electrical Engineering - PPgEE - Copele Campina Grande Paraíba Brazil Informatic Coordination Federal Institute of Paraíba Guarabira Paraíba Brazil Informatic Center Federal University of Paraiba João Pessoa Paraíba Brazil Mechanical Engineering Department Federal University of Paraiba João Pessoa Paraíba Brazil

ISBN: (纸本)9781479949120

A way to deal with the variations in the link quality of Wireless Sensor Networks (WSN) is the use of strategies for Dynamic Channel Allocation (DCA). The first step to perform DCA is estimating the channel quality, so that the network nodes can decide if a channel change is needed, and the best channel to be used. This paper proposes a distributed approach with nodes dedicated to monitor channel quality, by using the Received Signal Strength Indication (RSSI) and the Link Quality Indicator (LQI) to identify low quality channels. This approach is acceptable in industrial WSN, since the network deployment can be performed with adequate planning. Furthermore, the sensor nodes do not need to stop their operation for monitoring the channel quality. As a first step, experiments were performed in a real industrial environment to identify the relation between RSSI and LQI traces, and the Packet Error Rate for different channels, by using IEEE 802.15.4 radios operating in the 2.4 GHz band. © 2014 IEEE.

关键词： Sensor nodes

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Using linear discriminant function to detect eyes closing activities through alpha wave

Using linear discriminant function to detect eyes closing ac...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Denis Delisle-Rodriguez Javier F. Castillo-Garcia Teodiano Bastos-Filho Anselmo Frizera-Neto Alberto Lopez-Delis Post-Graduate Program of Electrical Engineering Federal University of Espirito Santo Vitoria Brazil Center of Medical Biophysic University of Oriente Santiago de Cuba Cuba

This work presents an alternative method to detect events correlated to eyes opening and closing, based on electroencephalography (EEG) measured from the occipital lobe. The goal is to propose a method based on linear discriminant function to classify segments of EEG signals that contain activities originated by eyes closing. A linear discriminant function presented by Fisher is employed to detect these activities on segments of 2s. This method showed a good values of sensitivity (SE ≥ 85 %) and specificity (SP ≥ 60 %). This approach can be used to control the switching of a brain computer interface (BCI).

关键词： Electroencephalography Training Fractals Testing Sensitivity Switches Sensitivity and specificity

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A software framework for user-level power management

A software framework for user-level power management

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IEEE International Conference on Consumer Electronics - Berlin (ICCE-Berlin)

作者： Bruna M. J. C. Vilar Diógenes G. Gondim Zeus C. Barros Frederico M. Bublitz Hyggo O. Almeida Angelo Perkusich Post-Graduate Program in Electrical Engineering–PPgEE–COPELE Embedded Systems and Pervasive Computing Lab Center for Strategic Technologies in Health–NUTES State University of Paraiba–UEPB Electrical Engineering Department (DEE) Federal University of Campina Grande–UFCG

Most operating systems implement their own power management techniques, but it is hard to modify or hack their power policies without the source code. Many dynamic power management architectures have been proposed in the literature, but they are not integrated with the underlying OS power manager. In this work, we propose a software framework for user-level power management, with a flexible architecture to be adapted to different policies and integrated with OS power managers.

关键词： Power demand Middleware Operating systems Network interfaces Mathematical model Estimation

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An Ethernet sniffer for On-line acquisition of EEG with the BrainNet36® device applied to a BCI

An Ethernet sniffer for On-line acquisition of EEG with the ...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Alessandro Botti Benevides Anibal Cotrina Atencio Javier Castillo Teodiano Freire Bastos Filho Alessander Botti Benevides Electrical Engineering Post-Graduate Program Federal University of Espirito Santo Vitória Espírito Santo Brazil ICT Doctoral School University of Trento Trento Trentino Italy

This paper presents an Ethernet sniffer programmed in ANSI C to export in an on-line way the electroencephalographic (EEG) data acquired with the device BrainNet36 ® , which is a Brazilian EEG device for clinical and polysomnography purposes. The sniffer proved to be useful for off-line analysis of the EEG and also for on-line applications, as Brain Computer-Interfaces (BCIs). Despite its limitations and packet losses at around 1.7% due to noise, the off-line analysis of the EEG successfully replicated results of the literature regarding the Event-Related (De)Synchronization (ERD/ERS) and Evoked Potentials (EPs) calculated for mental tasks. For on-line applications the sniffer was used to program a single-switch BCI for on-line classification of motor and no motor mental tasks with high success rate. Nowadays, the BrainNet36 ® device is being used for EEG research at many Brazilian universities, therefore, we hope that this article may encourage on-line applications. Finally, as the sniffer operation is explained here with examples, this text may serve as a reference guide for potential user's.

关键词： Electroencephalography Electrodes Educational institutions Noise Scalp Protocols MATLAB

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